Bifocal double group lens assembly

Details Bifocal double group lens assembly Bifocal double group lens assembly

2007-06-26

2007-06-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

11458703

ABSTRACT:
A bifocal double group lens assembly, sequentially from the object side, comprises: a stationary first lens group with a negative refractive power, a second lens group with a positive refractive power being moveable along optical axis. The second lens group, at two different positions, can focus appropriately on an infinitely distant object when moving along the optical axis. When the lens assembly is in the wide angle mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the object side for focusing. When the lens assembly is in the Tele mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the image side for focusing. A linear driver is employed to move the second lens group for executing the function of two-section zoom and continuous focus.

REFERENCES:
patent: 5552936 (1996-09-01), Ohno
patent: 6025961 (2000-02-01), Kohno et al.

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